Editors

Many common text editors can be used to edit TorqueScript files. Some favourites include Sublime Text, Notepad++, Programmer's nodepad, and good old Notepad, Gedit, or TextEdit.
Many editors also support cscope and cscope works with TorqueScript. So you can use cscope for jumping around in the code.

Vim

You can use these plugins to get proper TorqueScript and TAML XML syntax highlighting in vim. Note that this extension will override C# syntax highlighting due to TS's use of the .cs extension.

Notepad++

You can use this plugin to get proper TorqueScript syntax highlighting in Notepad++. Note that this extension will override C# syntax highlighting due to TS's use of the .cs extension.

Atom

IDEs

Integrated Development Environments let you do more than just edit TorqueScript files - they provide additional features to boost your productivity, such as code browsing and searching, debugging, and syntax checking.